A bomb threat that prompted a lockdown and evacuation of the Crook County Middle School in Prineville Tuesday evening was apparently a hoax, police reported.

A bomb threat written on the wall of the Crook County Middle School in Prineville prompted an evacuation and lockdown, but no bomb was found during a thorough search.

Prineville police officers responded to the school at 100 NE Knowledge Street about 6 p.m., April 18 when they were alerted to a threat written on the wall of a boys’ bathroom indicating there was a bomb in a specific locker on school property.

The school was locked down and evacuated, Prineville Police Chief Eric Bush said.The Oregon State Police Bomb Squad was called in from Salem, but they found no explosive device in the locker specified in the written threat.

“As a precaution, the school and every locker in the school were searched,” the chief said.An investigation to determine who made the threat is ongoing.